It could be just poor quality parts too?
I have seen a bunch of those cheaper fittings leak and or be made with improper dimensions (-6an fitting, but only a 3/16" ID ??)
That brings that filter/ regulator into question as well??
That is why I will only use better quality parts (ie AC Delco, Wiks, Russel, Earls, etc)
Never had a issue with the better parts (yes, more expensive, but you get what you pay for!!)
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